Abstract: A microneedle using a biodegradable metal is represented by Chemical Formula 1 and is absorbed and degraded after subcutaneous or epithelial insertion to thus release metal ions and degradation products into the body. In Chemical Formula 1, a, b, and c represent wt % of respective ingredients, a+b+c=100 wt %, a or b has the highest value in the range of 0?a?100, 0?b?100, and 0?c?10, and X is one or more selected from the group consisting of Ca, Fe, Mn, Si, Na, Zr, Ce, and P.

Abstract: The present invention includes: a substrate portion; a needle portion provided at the substrate portion and protruding from the substrate portion to be inserted into skin; and a perforated portion provided at a junction between the needle portion and the substrate portion, wherein either of the substrate portion and the needle portion is made of the bioabsorbable metal.

Abstract: A microneedle using a biodegradable metal is represented by Chemical Formula 1 and is absorbed and degraded after subcutaneous or epithelial insertion to thus release metal ions and degradation products into the body. In Chemical Formula 1, a, b, and c represent wt % of respective ingredients, a+b+c=100 wt %, a or b has the highest value in the range of 0?a?100, 0?b?100, and 0?c?10, and X is one or more selected from the group consisting of Ca, Fe, Mn, Si, Na, Zr, Ce, and P.

Abstract: This invention relates to a biodegradable implant including magnesium, wherein the magnesium contains, as impurities, (i) manganese (Mn); and (ii) one selected from the group consisting of iron (Fe), nickel (Ni) and mixtures of iron (Fe) and nickel (Ni), wherein the impurities satisfy the following condition: 0<(ii)/(i)?5, and an amount of the impurities is 1 part by weight or less but exceeding 0 parts by weight based on 100 parts by weight of the magnesium, and to a method of manufacturing the same.

Abstract: The present invention relates to a magnesium alloy having controlled corrosion resistance properties, which comprises magnesium (Mg) and an alloying element and includes a magnesium phase and a phase composed of magnesium and the alloying element, wherein the difference in electrical potential between the magnesium phase and the phase composed of magnesium and the alloying element is greater than 0 V but not greater than 0.2 V.

Abstract: This invention relates to a biodegradable implant including magnesium, wherein the magnesium contains, as impurities, (i) manganese (Mn); and (ii) one selected from the group consisting of iron (Fe), nickel (Ni) and mixtures of iron (Fe) and nickel (Ni), wherein the impurities satisfy the following condition: 0<(ii)/(i)?5, and an amount of the impurities is 1 part by weight or less but exceeding 0 parts by weight based on 100 parts by weight of the magnesium, and to a method of manufacturing the same.

Abstract: The present invention relates to a magnesium alloy having controlled corrosion resistance properties, which comprises magnesium (Mg) and an alloying element and includes a magnesium phase and a phase composed of magnesium and the alloying element, wherein the difference in electrical potential between the magnesium phase and the phase composed of magnesium and the alloying element is greater than 0 V but not greater than 0.2 V.

Abstract: This invention relates to a biodegradable implant including magnesium, wherein the magnesium contains, as impurities, (i) manganese (Mn); and (ii) one selected from the group consisting of iron (Fe), nickel (Ni) and mixtures of iron (Fe) and nickel (Ni), wherein the impurities satisfy the following condition: 0</(i)?5, and an amount of the impurities is 1 part by weight or less but exceeding 0 parts by weight based on 100 parts by weight of the magnesium, and to a method of manufacturing the same.

Abstract: The present invention provides an implant, which is used to fix an artificial joint in bone, including a biodegradable magnesium alloy.

Abstract: The present invention relates to a magnesium alloy having controlled corrosion resistance properties, which comprises magnesium (Mg) and an alloying element and includes a magnesium phase and a phase composed of magnesium and the alloying element, wherein the difference in electrical potential between the magnesium phase and the phase composed of magnesium and the alloying element is greater than 0 V but not greater than 0.2 V.

Abstract: A system and method for authentication in a wireless mobile communication system are provided, in which a mobile station calculates a CMAC value having a first number of bits, transmits to a base station a ranging request message including a partial CMAC value being a second number of upper bits of the CMAC value having the first number of bits, and receives a ranging response message indicating whether authentication is successful or failed from the base station.

Abstract: Disclosed is a direction controllable electrode body, comprising a flexible body which comprises: a first electrode, comprising a body, a first cap joined to one end of the body, and a first electrode line connected to an other end of the body; an insulator in partial contact with the body and the first cap of the first electrode, said insulator functioning to insulate the first electrode from the second electrode; a second electrode, comprising a first ring in contact with the insulator, and a second electrode line connected to one end of the first ring; and a direction controller, comprising a first direction controlling wire communicating with the first electrode or the second electrode to control direction of the electrode body. Also, a guide pipe is provided for leading the electrode body to a target tissue.

Abstract: The present invention relates to treating an inter-vertebral disc, in particular, to a method of treating an inter-vertebral disc by effectively ablating a tissue within a disc, in which herniation of nucleus pulposus occurs. A method of treating an inter-vertebral disc according to one embodiment of the present invention relates to treatment using a guidable electrode to be inserted into an inter-vertebral disc of a patient, in which the treatment comprises a step of inserting a front end of a needle unit from the outside of annulus fibrosus into the inside of the annulus fibrosus, a step of inserting a guidable electrode through the rear of the needle unit, a step of adjusting position of the end of the electrode to be adjacent to a target tissue within the annulus fibrosus, and a step of ablating a tissue within nucleus pulposus by applying electrical energy to the electrode.

Abstract: This invention relates to a biodegradable implant including magnesium, wherein the magnesium contains, as impurities, (i) manganese (Mn); and (ii) one selected from the group consisting of iron (Fe), nickel (Ni) and mixtures of iron (Fe) and nickel (Ni), wherein the impurities satisfy the following condition: 0</(i)?5, and an amount of the impurities is 1 part by weight or less but exceeding 0 parts by weight based on 100 parts by weight of the magnesium, and to a method of manufacturing the same.

Abstract: A streaming service server includes means for bidding prices from a plurality of super peers and means for determining at least of the plurality of the super peers based on the received bidding prices such that for a given streaming service, a total number of consumers serviced by the plurality of the super peers satisfies a predetermined criterion. Therefore, the streaming service server may determine at least one super peer in a consideration with the number of consumers served by a plurality of super peers for a given service.

Abstract: A resource allocation method in a multicarrier communication system where a base station allocates resources to a plurality of mobile stations according to feedback channel information from the mobile stations. The base station receives a resource request message from each mobile station and selects a set of mobile stations offering a maximum system gain without overlapped resources at a specific point in time based on the resource request messages from all mobile stations in the system. The requested resources and then allocated to the selected mobile stations.

Abstract: A system and method for authentication in a wireless mobile communication system are provided, in which a mobile station calculates a CMAC value having a first number of bits, transmits to a base station a ranging request message including a partial CMAC value being a second number of upper bits of the CMAC value having the first number of bits, and receives a ranging response message indicating whether authentication is successful or failed from the base station.

Abstract: A resource allocation method in a multicarrier communication system where a base station allocates resources to a plurality of mobile stations according to feedback channel information from the mobile stations. The base station receives a resource request message from each mobile station and selects a set of mobile stations offering a maximum system gain without overlapped resources at a specific point in time based on the resource request messages from all mobile stations in the system. The requested resources and then allocated to the selected mobile stations.